Hoisting mechanism for glass-drawing apparatus



L. S. SKELTON. HOISTING MECHANISM FOR GLASS DRAWING APPA RA'IUS.

APPLICATION FILED' JUNE 26. I917- Patented Dee. 28, 1920.

. barre starts LEVI SHERMAN SKELTON, 0F OKMULG-EE, OKLAHOMA.

HOIS'IING- MECHANISM FOR GLASS-DRAWING APPARATUS.

Application filed June 26,

To all whom it may concern:

Be it known that l, LEVI SHERMAN SKEL- TON, a citizen of the United States, residing at Okmulgee, in the county or Okmulgee and State of Oklahoma, have invented new and useful Improvements in Hoisting Mechanism for Glass-Drawing iipparatus, of which the following is a specification.

This invention relates to hoisting mechanism for glass drawing apparatus, designed for the purpose of raising and lowering the draw-carriage, whereby the drawing tool is operated, the primary object of the invention being to provide a hoisting mechanism whereby the draw-carriage and drawing tool may be slowly raised at the beginning of the draw, and thereafter raised at a gradually increasing speed in the drawing out of the glass cylinder.

A. further object of the invention is to provide a hoisting mechanism embodying a hoisting drum and cable, and in which the construction is such as to cause the coils or convolutions of the cable, as they are wound upon the drum, to wind upon one another, whereby the effective diameter of the drum is gradually and progressively increased, to secure the result stated.

A still further object of the invention is to provide a hoisting mechanism embodying a motor, preferably of the electrical type, driven at a substantially constant speed, in connection with a train of reducing gearing for driving the drum at relatively reduced s eed.

With these and other objects in view, the invention consists of the features of con struction, combination and arrangement of parts hereinafter fully described and claimed, reference being had to the accompanying drawing. in which:

Figure 1 is a side elevation of the drawcarriage, drawing tool, and a hoisting mechanism constructed in accordance with my I invention.

Fig. 2 is a top plan View of the drum and drive gearing.

Fig. 3 is a vertical section through the drum taken at right angles to the plane of its axis.

Referring to the drawing, 1 designates the draw-carriage, which is mounted to travel vertically upon a track way composed of rails 2, one of which is shown, and which supports the drawing tool 3, which may be constructed and mounted as set forth in a co-pending application for take-down de- Specification of Letters Patent.

Patented Dec. 28, lltl2.

1917. Serial No. 176,977.

vice, executed of even date herewith, and filed June 26, 1917, Serial No. 176,976.

The carriage 1 is raised and lowered through the medium of a cable l, which is attached at its lower end thereto and at its upper end to the hub portion 5 of a winding drum 6. This drum 6 is composed of the hub portion 5 and a pair of spaced disks 7, and is mounted for revolution upon and with a horizontal shaft 8.

The disks 7 are spaced a comparatively small distance apart, whereby the cable receiving groove of the drum is made of a width according substantially with the thickness or diameter of the cable a. By this constructon the coils or convolutions oi. the cable, as the cable winds upon the drum, are prevented from winding in parallel relation or in a direction longitudinally er the shaft 8, and are caused to wind upon one another. As a result, each coil as it winds upon the drum forms a surface of greater diameter than the preceding coil on which the succeeding coil winds, whereby the effective diameter of the drum is gradually and progressively increased as the cable winds thereon in the upward travel of the draw-carriage. By this means the carriage will be elevated at a comparatively low speed at the beginning of the draw, and with gradually increasing or accelerated speed as the draw progresses, whereby greater speed and eiiiciency in the drawing action are obtained.

It will be observed that in this winding action the portion of the cable between the draw-carriage and winding drum necessarily has, in addition to its upward traveling motion, a secondary motion lateral to a direct vertical line of travel, due to the constant increase in the diameter of the drum as the cable is wound up. Such lateral motion is, of course, objectionable owing to its tendency to rock the draw-carriage and drawing-tool and cause resultant strain upon the cap of the cylinder. 1, however, reduce this lateral motion to a minimum degree by the use of a drum of the character specified, which imparts but a single lateral motion, in one direction to the cablei. 6., in a direction at right angles to the plane of the guides,in contradistinction to the use of a drum having a spiral groove or series of spiral grooves, which causes the cable to partake of a compound lateral in a direction at other than a right angle to the guides, such motion being due to its travel along the groove and to the increase in diameter of the portions of the groove as the cable travels therealong. It will be evident that such compound motion is objectionable because of the pull on the carriage by the action of the cable at such an angle, other than a right angle, to the vertical line of draw, causing undesirable pressure of the carriage on the guides in a plane parallel with the plane of the guides, as well as in a plane at right angles to the plane of the guides. By thus reducing and minimizing the lateral motion of the cable, and the consequent tendency to rocking motion of the drawcarriage and drawing-tool, liability of frac-' ture of the cap is reduced to a material degree, with obv1ous advantages in the drawing operations.

I The drum 6 is operated by and from a motor 9, preferably of the electrical type, through the medium ofa train of reducing gears. As shown, the motor shaft carries or is provided with'a worm 10 meshing with a worm gear 11 loose on a driving shaft 12. A clutch device is provided for throwing the gear 11 into and out of connection with the shaft 12, and this clutch device comprises friction clutch members 13 and 14, the member 13 being fixed to the gear 11 and the member 14 being feathered to slide upon and rotate with the shaft 12 and being provided with a grooved collar 15, for connection with a shipper-lever or the like, whereby the clutch member 1 1 may be thrown into and out of engagement with the gear member 13 to connect the gear train with and disconnect it from the motor.

It will be understood, of course, that at the beginning of the draw the gearing is thrown into action to effect the operation of the winding drum and the raising of the draw-carriage 1, and thatafter the draw is completed and the cylinder removed the gearing isthrown out of action to permit the carriage to descend by gravity and the cable to unwind at a uniform and regulated rate of speed, governed by the resistance of the gear- The shaft 12 also carries a pinion 16 which meshes with a larger transmission gear 17 on an intermediate or transmission shaft 18, to which shaft is fixed a pinion 19, of relatively smaller diameter than the pinion 16, and which meshes with a gear 20 on the drum shaft 8, which gear 20 is preferably of the same diameter as the gear 17 whereby, through the reducing action of said gearing, the motor shaft may revolve at a high rate of speed while the drum 6 will be driven at a comparatively low rate of speed, as will be readily understood.

It will thus be seen that my invention provides a hoisting mechanism of simple construction which is at all times under the complete control of the operator, and which is adapted, without the use of complex means,.

a hoisting cable connected with the draw car- 7 rlage, and a winding drum connected wlth the cable and arranged above the extreme elevation of travel of the carriage and having 7 a narrow groove in which the cable is adapted to wind in a single planeand in superposed concentric convolutions, said drum being revoluble on an axis parallel with the plane of the guides and so disposed that in the winding action the cable will be moved laterally out of a direct vertical drawing line in a direction at right angles only to the plane of the guides.

In testimony whereof I aflix my signature in presence of a witness. I

f L. SHERMAN. SKELTON.

Witness: 7

BENNETT S. JONES. 

